Year 12s: what will be the first way you research your future options? >>

Designing an experiment?

A vegetarian claims that she is receiving all 8 essential amino acids by eating beans. Plan and design an experiment to verify if the vegetarian is correct.

Ok, I know the 8 essential AA's and I know of the Ninhydrin test (not sure about this) and I think the beans doesn't contain all 8. How do I (extract?) or test for the amino acids that are inside the beans? Are there a individual tests for each of the essential AA? (Remember that this is A'level so nothing too complex)